body {
    background: url('../img/stone-art.jpg');
    background-repeat: no-repeat;
    background-size: cover;
}

.div1 {
    background: white;
    max-width: 20em;
    padding: 2em;
    margin: 2em;
    font: inherit;
    box-shadow: 0 0 0 10px #59a;
}

.div2 {
    background: white;
    max-width: 20em;
    padding: 2em;
    margin: 2em;
    font: inherit;
    outline: 5px solid #59a;
    outline-offset: -10px;
}

.div3 {
    background: white;
    max-width: 20em;
    padding: 2em;
    margin: 2em;
    font: inherit;
    border: 10px solid #655;
    outline: 5px solid #59a;
    border-radius: 1.5em;
}